<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="lib/react.js"></script>
    <script src="lib/react-dom.js"></script>
    <script src="lib/browser.js"></script>
</head>
<body>
    

    <div  id="root"></div>

    <script  type="text/babel">

        
        //jsx     javascript + xml  
        ReactDOM.render(<h1>hello world</h1>,document.getElementById("root"))

    </script>
</body>
</html>